To be________, they have to think about the future and deal with the problems involving waste water.

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问题 To be________, they have to think about the future and deal with the problems involving waste water.

选项 A、sustainable
B、authentic
C、critical
D、innocent

答案A

解析 考查形容词辨析。句意:为了可持续发展,他们必须考虑未来,并处理废水问题。sustainable意为“可持续的”;authentic意为“真实的”;critical意为“批判的”;innocent意为“无辜的;天真的”。根据句意可知,只有处理污水,才能有未来的可持续发展。故选A。
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